Definitely going to see it the first weekend.
Now an interesting concept for you to chew on. In theory since a lightsaber is energy, the color you see is just the wavelength of light given off by the blade, well if you're a creature that can see infrared/ultraviolet (can't think of any right now), then why not use a crystal that focuses it into one of those colors. Human's can't see where it is, but you can fine!